Furnace



R. E. TALLEY.

FURNACE:

APPLICATION FILED JUNE 9, 1920.

Patentefi Dec. 14, 1920.

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R. E. I'ALLEY.

FURNACE.

APPLICATION FILED JUNE 9, 1920.

Patented Dec. 14, 1920..

c-- o o o Y 29 FIGS. 32

WITNESSES UNITED STATES PATENT "OFFICE.

RANDAL E. TALLEY, OF IRWIN, PENNSYLVANIA, ASSIGNOR TO GEORGE J. HAGAN COIIEANY, PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

FURNACE.

Specification of Letters latent. I Patented Dec. 14:, 1920.

Application flled' June 9, 1920. Serial No. 387,743.

To all whom it may concern:

siding at Irwin, in the county-of Westmoreland and State of Pennsylvania, a citizen of the United States, have invented or discovercd certain new and useful Improvements in Furnaces, of which improvements the fol lowing is a specification.

In an application filed October 4, 1919, Serial Number 328359, are described certain improvements in heating furnaces, said improvements being especially directed to so effecting the heating of the articles that they will not during such operation, be subjected to injurious gases. In said application the improvements are shown and described as embodied in a furnace for heating wire rods, sheets, etc.

Theinvention described herein which relates to the embodiment of such improvements in furnaces for heating a large variety of articles such as ax-heads, annular articles, etc., is hereinafter more fully described and claimed. e

In the accompanyingdrawings forming a part of this specification, Figure 1 is a sectional elevation of a continuous furnace em-- portion of the furnace; Figs. 4; and 5 are views similar to Figs. 1 and 2 illustrating certain improvements or modifications; Figs. 6 and 7 are detail views of portions of the conveying chain.

In the practice of the invention it is preferred that the furnace proper should be inclosed in a shell 26 formed of heat insulating material which will insure the stability of the structure and prevent the loss of heat. The furnace proper consists of a hearth 27 formed of refractory material and provided in its upperside w th one or more troughs 28 having a depth and width proportional to the dimensions of the articles to be treated.

While the strip of metal forming the heating element ma be given an desired form,

it lspreferred t at it should e bent to form convolutions as shown in Fig. 3, thereby pro -means.

convolutions extend back and forth across the portion of the troughs along which the artlcles are moved so that the articles will receive the heat directly from all of the strip except the small portions resting on the ledges. Wh1le not necessary it is preferred to mterpose blocks or strips of material havlng hl h insulating capacity between the ends 9 the convolutions and the ledges.

The troughs are closed by blocks 32 of refractory material, adjacent edges of the blocks being supported by an abutment 33 intermediate the troughs, said abutment being preferably cut away at intervals so as to form openings between adjacent troughs for the equalization of the heat in the several troughs or tunnels as they may be properly termed, thus permitting the heating elements of the several tunnels to be connected to a common controller.

In order to move articles through the furnace the bottoms of the troughs or tunnels are slotted as at 34 for the traverse of suitable means for engaging the article's. Such means are connected to an endless chain 35 passing around sprocket wheels 36 arranged at opposite sides of the furnace and in such relation to the hearth that the article engaging devices carried by the chain will extend up through the slot 34' and engage the articles. The shafts of the sprocket wheels are mounted in suitablebearings 37 and one of the shaftsis driven by a belt passing around a pulley 38 or by any other suitable The construction shown in Figs. 1 and 2 is designed to heat annular articles such as ring gears for automobiles, and the chain 35 is provided. with suitable spaced pins 39 adapted to pass into the rings and move them along t e tunnel into the distharge spout 40. In order to prevent injury as shown in Fig. 2.

volutions of the heating elements. Insuch a Feonstruction the convolutions will extend across a' plurality of tunnels. As in harden 1 ing and tempering ax-heads, only the' ortions of such heads at the'cutting e ge's should be heated, the heads are so supported by the means employed for moving them V that only the orti'ons to be heated will re ject-through tie slots into the tunnel' l he Walls ofthe slot are preferably of material of high heat insulating quality and are so shaped-and have such transverse dimensions that the sides of the slot will be.inclose' proximity. to the sides of the heads from direct heating. The chain is so constructed intermediate the pivotal connections of the links as to provide seats for the reception'of the butt ends of the ex heads and. support the latter in a vertical positionasshown in Figs. 6 and 7.

.1 F C im herein as myinvention: I- ,1. 'A- furnace having in combination a plurality of tunnels for the passage of a-rti cles to be heated, a heating element formedof a material capable of being raised to a high temperature Without the generation. 'of gases injurious to thearticle beingheated,

arranged in such relation to the paths of movement ofarticlesthrough the tunnels that heat Will'be radiated from said elements directly against thejarticles wherebya substantially uniform temperature may bemaintained in the several tunnels, and

means. exterior of the tunnels for raising the temperature of the heating ,element.

-A f-urnacehaving in combination a plurality of tunnels for the passage of artieles't be heated,' 1a heating element formed of material -capable -of being raised to a temperature ivithout the generation of gases injurious to the farticle being heated, arranged in such relation to the paths of movement of articles'through a plurality of tunnels that the' 'articles in each tunnel'will belsubjected to heat radiated from said Iele "3'. 'A' furnace havingin combination a ment,"said tunnels being so connected as to permit an equalizationof heat in the several tunnels, and means exterior'of the tunnels for raising the temperature oftheheating element.

v thereby protecting the main portions of the heads rality of tunnels for the passage of articles to be heated, a heating element so constructed and arranged that portions will estend acrossa plurality of-tunnels and in operative proximity to the paths of movement of articles through. the tunnels, wherebyv substa'ntially e al temperatures will be maintained in all the tunnels, and means exterior .of the tunnels for raising the temperature of-the heating element. 7

4. A furnace having in eombinatien. a plurality of tunnels for the passage of articles to be heated, a heating element consisting of convoluted strips of metal supported in operative relation to the paths of mgvement of the articles through a plurality of tunnels and means exterior of the tunnels for raising the temperature of the heating element. I

5.'A furnace having n combination a plurality of tunnels for the passage of articlesto be heated, heating elements consisting of convoluted strips of metal, means for so supporting the heating elements that the convolutions Will extend transversely of the tunnels and above the paths of movement of the articles through the tunnels, and means exterior of'the tunnels for raising the temperature of the heating elements.

6. A,meansfor heating articles consisting of a tunnel through which the articles are passed,-a heating element consisting of a con: pluted-strip-of conducting material so supported" within the tunnel that the portions of'the convolutions willbe at an angle to the direction of movement of articles through the tunnel and-an electric generator connected to the conducting element.

' 7. A means for heatingarticles consist ing of a tunnel, means for moving articles continuously through thetunnel, aheating element consisting of an electrically heated convolutedstrip of conducting materlal, the

'convolutions extending across the tunnel;

8. A means for heating articles consisting of a longitudinally slotted'tu'nnel, means for moving articles along the tunnel, electrieally heated convoluted strips of conductiie ing material, and means for so supporting.

the conducting strip that itsoonvolutiofns vvillextend acrossthe tunnel above thepath of movement of-the articles to be heated."

9. A furnace having'in combina'tionHa tunnel for the passage of articles to beheat-- ed, nieansfor'moving articles through said tunnels, a heating. element consistin'g of". a plurality of substantially parallel members the opposite-ends of each member being connected. respectivelyto members on opposite-y.

' sides thereof} said heating element being arranged above the path of articles through -the tunnel and means exterior of the tunnel for raising the temperature of t e. heating element.'-

iur aq hides mmhinatien a plurality of tunnels for the passage of artiarticles through the tunnels 'and means excles to be heated, menus for moving articles terior of the tunnels for raising the temper: v through said tunnels, a; heating element conattire of the heating element. 10

sisting of a convoluted strip of metal so In testimony whereof I have hereunto set 5 constructed and suppoi'ted that the convolumy hand.

tions extend across two or more of said tunnels and above the paths of movement of the RANDAL E. TALLEY; 

